Grate-bar and shaker therefor



Sheet 1.

2 Sheets Patented Sept A. STROH. GRATB yBAR AND SHAKER THEREFOR.

IlllHi {No Model.)

` WITNESSES 2 Shee'cs-Sheet 2.

(No Model.)

A. STROH. GRATE BAR AND SHAKER THEREPOR.

Patented Segni-17.1897

/NVENTR ATTORNEYS.

w: Nonsls Ferias co. Pao-mums., wAsmNumu, o, c,

UNiTEn STATES .PATENT reinar i ABRAHAM STROH, OF FREELAND, PENNSYLVANIA.

GRATE-BAR AND SHAKER THEREFOR.

SPECIFICATION forming part of Letters Patent No. 589,629, datedSepternber-Z 1897'm Applitn filed September 23, 189G- Serial No. 606,695. (No model.)

.To allzu/wm may concern,.- p

Be it known that I, ABRAHAM STROH, of Freeland, in the county Luzerne and State of Pennsylvania, have invented a new and useful Improvement in Gratedars and Shakers Therefor, of which the following is a full,clear, and exact description.

This invention relates to grate-bars for lirechambers under boilers and for analogous uses, and more particularly to a class of gratebars that are connected for rocking movement to agita-te the bed of coals or other incandescent material thereon.

The object of any invention is to provide novel details ot' construction for grate-bars .and shaking devices therefor which will be drawings, forming a part of this specification in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan viewot two sets of the improved grate-bars supported to rock on a suitable frame and a rockin g device therefor, shown mainly by dotted lines. Fig. 2 is an end elevation of 'the grateesupporting frame, the novel grate-bars thereon, and a device connecting the grate-bars for a simultaneous rocking movement, the frame being broken away to expose portions of the said rocking device. Fig. 3 is a transverse sectional view of the grate-supporting frame substantially on the line 3 in Figs. l and 2, two of the novel grate-bars being showuin position on the frame and longitudinally alined, and a rocking device for the grates g and Fig. e is an enlarged transverse sectional view of one grate-bar substantially on the line i i in Fig. 3.

ln carrying into elect the features of improvement a rectangular` bearing-frame l0 is provided that is cast from metal and has substantial walls that are preferably scalloped on their lower edges to remove material between the corners of the frame, and thus render it as light as is consistent with necessary strength.

The bearing-frame 10, that is to support in l a level condition one or more sets of gratebars, may be afforded such dimensions as will adapt it to occupy the entire area of a walled lire-chamber and be therein suitably snpported for maintenance of the grate-bars. Should, however, the dimensions of the hrechamber be so large as to render such a proportion of the bearing-frame objectionable, then two or more ofsaid frames may be furnished and held in the masonry lire-chamber in the same horizontal plane.

There are two inwardly-extendin g ledges a,

formed on the inner surface of each frame lO at a correct distance from its upper edge on opposite sides thereof, which ledges receive and support the similar carrier-bars 1l, whereon a set of grate-bars l2 are supported by a journaled engagement of their ends therewith, as will be further explained.

Each carrier-bar ll consists of two parallel side walls integrally joined together at their lower edges by a bottom wall, as best shown in Fig. 3, and in these side walls, at suitable distances apart, notches l) are formed in their upper edges, which notches are preferablyY disposed oppositely in pairs.

The channeling of the carrier-bars ll renders them lightand strong7 and in serviceV ashes which accu mulate therein protect them from burning or warping and also keep the journal ends of the grate-bars from direct contact with the fire on the grate-surface.

The carrier-bars ll are arranged parallel in pairs on the bearing-frame lO, and where two series of grate-bars l2 are to be supported aside of each other, so that respective pairs of bars in the duplicate series will be longitudinally alined, then there is to be a transverse wall l0, formed or secured in the frame 10 at a proper distance from an outer side. wall of the bearingfra-me and parallel therewith, and the carrierbar1l, that sustains adjacent ends of the grate-bars in both series, is seated on said wall 10a, thus insuring necessarystability of the two sets of grate-bars at contiguous ends of the same.

The body of each plate-like bar is essentially lunulate in cross-section, as represented in Fig. et, the convex side of the same being uppermost in service.

At each end of the grate-bar body a flange cis formed, which flanges project consider.-

ably below the concave lower side of the bar, and preferably their edges are rendered substantially semicircular.

At each end of a grate-bar 12 a journ al-stud d is formed, which isin the form of a conefrustum, these similar journal projections bcing directly opposite each other, and the diameter of the studs is proportioned to the width of the notches b in the sides of the carrierbars 11, so as to adapt them to loosely occupy the opposite notches in two carrierbars, as is clearly shown in Figs. 1 and 3. The journals d are at the radial centers of the circular-edged depending flanges c, so that said flanges on adjacent grate-bars will be adapted to rock with their edges close together and avoid interference with each other.

The notches l) are preferably concave curved on their lower sides and their side walls and bottom and flared outward, the degree of flaring being suiicient in cach notch to allow the cone-frustum-shaped journal-studs (Z of the grate-bars 12 to have their outer end portions only in contact with the inner edges of the notches they-occupy, as is shown in Fig. 3, which construction and arrangement of parts will reduce the frictional contact of the journals d with the notched carrier-bars to a 1ninimum.

The bodies of the grate-bars 12 are each stiffened by a longitudinal rib e, that is integral therewith and projects from the lower surface at the transverse center, and at each side of the said rib the body of the grate-bar is nu lnerously perforated, which perfcrations y are coniform and of the greatest diameter at their lower en ds, this provision being made to facilitate the passage of ashes through the perforations and avoid clogging of the said holes.

f The breadth of the grate-bars 12 is so proportioned to the number in each set of the same and their journals are so spaced apart in the notched carrier-bars 1l that adjacent grate-bars will have their edges nearly in contact when said bars lie with the crowns of their convex. top faces in the same horizontal plane.

Preferably the upper edges of the notched sides of the carrierfbars 11 are convex-curved opposite the end of each grate-bar, so as to conform with the arched faces of the latter when the series of bars are arranged essentially level on their upper surfaces.

The pair of carrier-bars 11 for each series of grate-bars 12 are held spaced apart, so as to prevent cramping contact with the ends of the latter, by a pair of spacing-bars 13. Each spacing-bar is in the form of a rectangular metal strip that is slotted near each end on the same side edge, which slots permit the spacing-bars to be hooked upon the end portions of the carrierbars 11 at right angles therewith and near their ends.

It will be seen in Fig. 3 that the spacing bar 13, which engages with both of the carrierbars 11, has at its right-hand end an open notch at the lower corner of the said end and also is slotted at a correct distance from the `notch, the slot extending from the same edge as does the notch. The slot and notch are adapted to respectively engage with the spaced side walls of the carrier-bar at the right-hand side of the bearing-frame 10,which construction and arrangement of parts enables the pair of spacing-bars 13, that engage each pair ofy carrier-bars, to hold the latter parallel, preventing their displacement in an y direction.

It is essential that means be provided for rocking together' all the grate-bars of a series.y and to this end the following-described apparatus is furnished.

On the lower side of each grate-bar an arm 14 is downwardly projected, said arms being near like ends of the grate-bars of a series, and all are in the same vert-ical plane, having their sides essentially parallel with the transverse depending flanges c at the ends of the grate-bars. All the arms 14; of the grate-bars in a series are pivotal] y attached to a connecting-bar 15, which, if longitudinally moved, will correspondingly rock the grate-bars, as indicated by dotted lines in Fig. 2.

At a suitable distance from an end of one carrier-bar 11 the depending hanger-arm 1li is formed or secured on the carrier-bar, which arm is transversely perforated near its lower end for the reception of a short rock-shaft 17. that has a fixed collar h near its inner end and another collar t', securable on said shaft.

The adjacent side wall 10b of the bearingframe 10 is perforated opposite the perforation in the arm 16 to permit the shaft 17 to be projected outwardly through the wall inentioned, and thus receive support near each end of the same, and it will be seen that a proper adjustment of the securable collar a will retain the rock-shaft 17 in position free to rock.

The projecting end of the rock-shaft 17 is made polygonal on its periphery for the reception of the laterally-perforated end portion of the handle-lever 1S, which is afforded sufficient length to adapt it for efficient service.

The rock-shaft 17 is provided with a rockarm 19, that is fixed on the inner end thereof, and the free lower end of said arm is pivoted to one end of a link-bar 20, that at the other end is pivoted upon the connecting-bar 15. whereby the vibration of the handle-lever 18 will serve to rock all of the grate-bars with which it is connected.

Vhen there are two or more sets of gratebars placed upon the bearing-frame 10, so that opposite bars will be longitudinally alined. then it is advisable to provide a separate shaking apparatus for cach set of grate-bars. In this case another rock-shaft 21 is provided, which extends from the same side of the bearing-frame as does the short rock-shaft 17 and across the bearing-frame below the set of grate-bars that are rocked by the apparatus already described and in a like manner transmits rocking motion to the second set oi' gratebars when rocked by the handle-lever 1S, the rock-shaft 2l having its end that projects through the Wall.. 10b ot the bearing-frame made polygonal to lit the apertured end of said lever.

Should there be three series of grate-bars laterally arranged on the frame l0, a third shaft 22, for actuating a shaking apparatus, that is independently connected with said third set of grate-bars, is provided, so that each series of grate-bars may be rocked to remove ashes and clinkers therefrom.

In operation it will be seen that the rocking motion communicated to the grate-bars l2, as hereinbefore explained, will eiectively dislodge ashes and cinders that clog the iire on the grate-bars, and the arched form oi' the grate-bar bodies, together with the stiffeningrib on each bar, renders the grate-bars very strong and prevents warping from heat.

The perforations in each bar l2 aiord free passages for air throughout the area of the lire-bed. By providing separate series of grate-bars and independent shaking devices therefor the fire can be cleaned in sections, and thus enable the maintenance of heat in the furnace-chamber while the iire is being renovated.

The provision ot" the channeled carrier bars ll is a feature of merit, as the retention of ashes .in the channels of the saine prevents them from being burned out, as before mentioned, While the free rocking movement of the gratebars is permitted. Y

The end flanges c, formed on the grate-bars, strengthen them and enable their rocking movement to be etl'ected without a liability of clinhers locking the bars at their ends, as when the bars are thrown to incline their upper surfaces, as shown by dotted lines in Fig. z?, the flanges c will rook up on the high side of said grate-bars and keep coal or cinders from getting between the bodies of the grate-bars and upper edges of the carrier-bars.

Owing to the novel form and peculiar disposition of material in the improved gratebars it is evident that maximum strength with a minimum of the weight is secured.

Ilaving thus described my invention, I

having bearings therefor of a similar shape,

substantially as described.

3. A turn ace-grate,comprising a frame having inwardly-projecting ledges upon opposite sides, grate-carrying bars supported by and movable on said ledges, spacing-bars adapted to hold the grate-carrying bars in their adjusted positions, and grate-bars having a projecting pivot and transverse flange at each end, the lower edge of the ilange being con centric with the pivots and the grate-carrying bars having notches forming bearings for said pivots, substantially as described. y

4f. A furnace-grate,comprisin g a frame having inwardly-projecting ledges upon opposite sides, grate-carrying bars supported by and movable on said ledges, spacing-bars adapted to hold the gratecarrying bars in their adj usted positions, grate-bars having coniform projecting end journals, said grate-carrying bars having bearings therefor of a similar shape, and means for rocking the gratebars upon their pivots, substantially as described.

5. The combination with a bearing-frame, and transversely disposed carrying bars thereon, which are top channeled to provide parallel. flan ges thereon, of spacing-bars which are notched near their ends, and thus adapted to hook upon the carrier-bar dan ges and hold said bars spaced apart, as specified.

ABRAHAM STROH.

lVitnesses: A

M. E. MooNnv,

Enns. ORION STRoH. 

